Source code for shell32iconsform.cs

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using System;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace RobvanderWoude
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{
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	public partial class Shell32IconsForm : Form

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	{
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		public static string progver = "2.02";

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		public static int icon = 1;
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		public static NotifyIcon systrayicon = new NotifyIcon( );

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		public Shell32IconsForm( )
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		{
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			InitializeComponent( );
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			string[] args = Environment.GetCommandLineArgs( );

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			if ( args.Length > 1 )
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			{
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				ShowHelp( );
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			}
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		}
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		static void ShowHelp( )
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		{
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			string title = String.Format( "Shell32Icons {0} \xA9 2019 Rob van der Woude", progver );

			string helptext = String.Format( "Shell32Icons,  Version {0}\nView all icons available in Shell32.dll\n\n", progver );

			helptext += "The selected icon is displayed in this program's title bar and main window, and in the System Tray (a.k.a. Notification Area).\n\n";

			helptext += "Code to extract icons from Shell32.dll by Thomas Levesque:\nhttp://stackoverflow.com/questions/6873026\n\n";

			helptext += "Written by Rob van der Woude\nhttp://www.robvanderwoude.com";

			MessageBox.Show( helptext, title, MessageBoxButtons.OK, MessageBoxIcon.None );

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		}
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		private void UpdateIcon( )
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		{
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			icon = Convert.ToInt32( numericUpDown.Value );

			Shell32IconsForm.ActiveForm.Icon = IconExtractor.Extract( "shell32.dll", icon, true );

			iconBox.BackgroundImage = IconExtractor.Extract( "shell32.dll", icon, true ).ToBitmap( );

			systrayicon.Icon = IconExtractor.Extract( "shell32.dll", icon, true );

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			systrayicon.Visible = true;
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		}
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		private void Shell32IconsForm_FormClosing( object sender, FormClosingEventArgs e )

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		{
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			systrayicon.Visible = false;
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			systrayicon.Dispose( );
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		}
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		private void numericUpDown_KeyUp( object sender, KeyEventArgs e )

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		{
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			UpdateIcon( );
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		}
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		private void numericUpDown_ValueChanged( object sender, EventArgs e )

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		{
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			UpdateIcon( );
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		}
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		private void Shell32IconsForm_HelpRequested( object sender, HelpEventArgs hlpevent )

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		{
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			ShowHelp( );
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		}
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		// Code to extract icons from Shell32.dll by Thomas Levesque

		// http://stackoverflow.com/questions/6873026

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		public class IconExtractor
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		{
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			public static Icon Extract( string file, int number, bool largeIcon )

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			{
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				IntPtr large;
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				IntPtr small;
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				ExtractIconEx( file, number, out large, out small, 1 );

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				try
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					return Icon.FromHandle( largeIcon ? large : small );

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				}
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				catch
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				{
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					return null;
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				}
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			}
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			[DllImport( "Shell32.dll", EntryPoint = "ExtractIconExW", CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall )]

			private static extern int ExtractIconEx( string sFile, int iIndex, out IntPtr piLargeVersion, out IntPtr piSmallVersion, int amountIcons );

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		}
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	}
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}
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